From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from smtp.nokia.com ([131.228.20.172] helo=mgw-ext13.nokia.com)
	by bombadil.infradead.org with esmtps (Exim 4.68 #1 (Red Hat Linux))
	id 1IvTkI-0004Xu-Vy
	for linux-mtd@lists.infradead.org; Fri, 23 Nov 2007 03:18:49 -0500
Subject: Re: Some news for this: [PATCH] [MTD] BLOCK_RO: Readonly Block
	Device Layer Over MTD ?
From: Artem Bityutskiy <dedekind@infradead.org>
To: Ricard Wanderlof <ricard.wanderlof@axis.com>
In-Reply-To: <Pine.LNX.4.64.0711230836240.523@lnxricardw.se.axis.com>
References: <305035a40711210627p1ea1f2c0me1ee1f8e8d124552@mail.gmail.com>
	<20071121160804.GC20871@lazybastard.org>
	<305035a40711210828k65174f44t3d64e9ee33fe26bf@mail.gmail.com>
	<20071121105817.3adbfbb5@weaponx>
	<Pine.LNX.4.64.0711212145070.24710@lnxricardw.se.axis.com>
	<20071121213257.GI20871@lazybastard.org>
	<305035a40711211433x9054a11r11636ad708a325cd@mail.gmail.com>
	<20071121225425.GA24327@lazybastard.org>
	<Pine.LNX.4.64.0711220858190.523@lnxricardw.se.axis.com>
	<20071122132650.GA27525@lazybastard.org>
	<Pine.LNX.4.64.0711230836240.523@lnxricardw.se.axis.com>
Content-Type: text/plain; charset=utf-8
Date: Fri, 23 Nov 2007 10:18:24 +0200
Message-Id: <1195805904.3231.87.camel@sauron>
Mime-Version: 1.0
Content-Transfer-Encoding: quoted-printable
Cc: =?ISO-8859-1?Q?J=F6rn?= Engel <joern@logfs.org>,
	Linux mtd <linux-mtd@lists.infradead.org>
Reply-To: dedekind@infradead.org
List-Id: Linux MTD discussion mailing list <linux-mtd.lists.infradead.org>
List-Unsubscribe: <http://lists.infradead.org/mailman/listinfo/linux-mtd>,
	<mailto:linux-mtd-request@lists.infradead.org?subject=unsubscribe>
List-Archive: <http://lists.infradead.org/pipermail/linux-mtd>
List-Post: <mailto:linux-mtd@lists.infradead.org>
List-Help: <mailto:linux-mtd-request@lists.infradead.org?subject=help>
List-Subscribe: <http://lists.infradead.org/mailman/listinfo/linux-mtd>,
	<mailto:linux-mtd-request@lists.infradead.org?subject=subscribe>

Hi Ricard,

On Fri, 2007-11-23 at 08:42 +0100, Ricard Wanderlof wrote:
> In the case of mtd, it would seem that this should be done by JFFS2, or i=
f=20
> some intermediate layer is used like UBI, by that layer. As far as I know=
=20
> though, currently no scrubbing is done by either?

Nope, scrubbing was one of the design goals of UBI and it does do it.

If mtd_read() returns -EUCLEAN, which means a correctable ECC error
occurred (bit-flip), UBI schedules this physical eraseblock for
movement. Then it moves it in background, re-maps corresponding logical
eraseblock to the new physical eraseblock, and schedules the old
physical eraseblock for erasure.

--=20
Best regards,
Artem Bityutskiy (=D0=91=D0=B8=D1=82=D1=8E=D1=86=D0=BA=D0=B8=D0=B9 =D0=90=
=D1=80=D1=82=D1=91=D0=BC)